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In Visual Studio 2012, when a user attempts to activate they run into the following error:
System.Net.WebException: The remote server returned an error: (401) Unauthorized.
at Xamarin.Components.Ide.Web.RequestHelper.GetResponse(Func`1 createRequest, Action`1 prepareRequest, CancellationToken token)
at Xamarin.Components.Ide.SSO.Client.DoRequest(String endpoint, String method, String body, CancellationToken cancellationToken)
at Xamarin.Components.Ide.SSO.Client.CreateToken(String email, String password, CancellationToken cancellationToken)
Created attachment 5904 [details]
Screen shots of errors
Looking at the screen shots from the document, it looks to be a proxy server issue. The grey dialog that pops up looks like a proxy authentication dialog. This is not a dialog that the xamarin site would produce as far as I can tell.
Are you running the software behind a proxy server?
It looks like this issue was due to the proxy server. The user had attempted to enter their own proxy credentials. Once the logging for the proxy processing any Xamarin.com, the activation occurred successfully.
Based on that, I'll close this bug :)